I get an error saying: 400 Bad Request, Size of a request header field exceeds server limit. What is this?

This is caused by an old version of the "Metafilter Scroll Tag" script. The same old script can also cause intermittent logging out for some browsers. The full error message is: 400 Bad Request - Your browser sent a request that this server could not understand. - Size of a request header field exceeds server limit.

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